[docs] [issue15561] update subprocess docs to reference io.TextIOWrapper

[Chris Jerdonek]

Chris Jerdonek added the comment:

In the process of working on issue 15595, I noticed that the documentation change will need to be slightly different for Python 3.2 than for 3.3.  In 3.2, it is locale.getpreferredencoding() (which defaults to do_setlocale=True) instead of locale.getpreferredencoding(False).

I will provide a patch adjusted for 3.2.

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<http://bugs.python.org/issue15561>
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